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path: root/drivers/media/video/videobuf-core.c
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Diffstat (limited to 'drivers/media/video/videobuf-core.c')
-rw-r--r--drivers/media/video/videobuf-core.c1006
1 files changed, 1006 insertions, 0 deletions
diff --git a/drivers/media/video/videobuf-core.c b/drivers/media/video/videobuf-core.c
new file mode 100644
index 000000000000..c606332512b6
--- /dev/null
+++ b/drivers/media/video/videobuf-core.c
@@ -0,0 +1,1006 @@
+/*
+ * generic helper functions for handling video4linux capture buffers
+ *
+ * (c) 2007 Mauro Carvalho Chehab, <mchehab@infradead.org>
+ *
+ * Highly based on video-buf written originally by:
+ * (c) 2001,02 Gerd Knorr <kraxel@bytesex.org>
+ * (c) 2006 Mauro Carvalho Chehab, <mchehab@infradead.org>
+ * (c) 2006 Ted Walther and John Sokol
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/slab.h>
+#include <linux/interrupt.h>
+
+#include <media/videobuf-core.h>
+
+#define MAGIC_BUFFER 0x20070728
+#define MAGIC_CHECK(is,should) if (unlikely((is) != (should))) \
+ { printk(KERN_ERR "magic mismatch: %x (expected %x)\n",is,should); BUG(); }
+
+static int debug = 0;
+module_param(debug, int, 0644);
+
+MODULE_DESCRIPTION("helper module to manage video4linux buffers");
+MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@infradead.org>");
+MODULE_LICENSE("GPL");
+
+#define dprintk(level, fmt, arg...) if (debug >= level) \
+ printk(KERN_DEBUG "vbuf: " fmt , ## arg)
+
+/* --------------------------------------------------------------------- */
+
+#define CALL(q, f, arg...) \
+ ( (q->int_ops->f)? q->int_ops->f(arg) : 0)
+
+void* videobuf_alloc(struct videobuf_queue* q)
+{
+ struct videobuf_buffer *vb;
+
+ BUG_ON (q->msize<sizeof(*vb));
+
+ if (!q->int_ops || !q->int_ops->alloc) {
+ printk(KERN_ERR "No specific ops defined!\n");
+ BUG();
+ }
+
+ vb = q->int_ops->alloc(q->msize);
+
+ if (NULL != vb) {
+ init_waitqueue_head(&vb->done);
+ vb->magic = MAGIC_BUFFER;
+ }
+
+ return vb;
+}
+
+int videobuf_waiton(struct videobuf_buffer *vb, int non_blocking, int intr)
+{
+ int retval = 0;
+ DECLARE_WAITQUEUE(wait, current);
+
+ MAGIC_CHECK(vb->magic,MAGIC_BUFFER);
+ add_wait_queue(&vb->done, &wait);
+ while (vb->state == STATE_ACTIVE || vb->state == STATE_QUEUED) {
+ if (non_blocking) {
+ retval = -EAGAIN;
+ break;
+ }
+ set_current_state(intr ? TASK_INTERRUPTIBLE
+ : TASK_UNINTERRUPTIBLE);
+ if (vb->state == STATE_ACTIVE || vb->state == STATE_QUEUED)
+ schedule();
+ set_current_state(TASK_RUNNING);
+ if (intr && signal_pending(current)) {
+ dprintk(1,"buffer waiton: -EINTR\n");
+ retval = -EINTR;
+ break;
+ }
+ }
+ remove_wait_queue(&vb->done, &wait);
+ return retval;
+}
+
+int videobuf_iolock(struct videobuf_queue* q, struct videobuf_buffer *vb,
+ struct v4l2_framebuffer *fbuf)
+{
+ MAGIC_CHECK(vb->magic,MAGIC_BUFFER);
+ MAGIC_CHECK(q->int_ops->magic,MAGIC_QTYPE_OPS);
+
+ /* FIXME: This is required to avoid OOPS on some cases, since mmap_mapper()
+ method should be called before _iolock.
+ On some cases, the mmap_mapper() is called only after scheduling.
+
+ However, this way is just too dirty! Better to wait for some event.
+ */
+ schedule_timeout(HZ);
+
+ return CALL(q,iolock,q,vb,fbuf);
+}
+
+/* --------------------------------------------------------------------- */
+
+
+void videobuf_queue_core_init(struct videobuf_queue* q,
+ struct videobuf_queue_ops *ops,
+ void *dev,
+ spinlock_t *irqlock,
+ enum v4l2_buf_type type,
+ enum v4l2_field field,
+ unsigned int msize,
+ void *priv,
+ struct videobuf_qtype_ops *int_ops)
+{
+ memset(q,0,sizeof(*q));
+ q->irqlock = irqlock;
+ q->dev = dev;
+ q->type = type;
+ q->field = field;
+ q->msize = msize;
+ q->ops = ops;
+ q->priv_data = priv;
+ q->int_ops = int_ops;
+
+ /* All buffer operations are mandatory */
+ BUG_ON (!q->ops->buf_setup);
+ BUG_ON (!q->ops->buf_prepare);
+ BUG_ON (!q->ops->buf_queue);
+ BUG_ON (!q->ops->buf_release);
+
+ /* Having implementations for abstract methods are mandatory */
+ BUG_ON (!q->int_ops);
+
+ mutex_init(&q->lock);
+ INIT_LIST_HEAD(&q->stream);
+}
+
+int videobuf_queue_is_busy(struct videobuf_queue *q)
+{
+ int i;
+
+ MAGIC_CHECK(q->int_ops->magic,MAGIC_QTYPE_OPS);
+
+ if (q->streaming) {
+ dprintk(1,"busy: streaming active\n");
+ return 1;
+ }
+ if (q->reading) {
+ dprintk(1,"busy: pending read #1\n");
+ return 1;
+ }
+ if (q->read_buf) {
+ dprintk(1,"busy: pending read #2\n");
+ return 1;
+ }
+ for (i = 0; i < VIDEO_MAX_FRAME; i++) {
+ if (NULL == q->bufs[i])
+ continue;
+ if (q->bufs[i]->map) {
+ dprintk(1,"busy: buffer #%d mapped\n",i);
+ return 1;
+ }
+ if (q->bufs[i]->state == STATE_QUEUED) {
+ dprintk(1,"busy: buffer #%d queued\n",i);
+ return 1;
+ }
+ if (q->bufs[i]->state == STATE_ACTIVE) {
+ dprintk(1,"busy: buffer #%d avtive\n",i);
+ return 1;
+ }
+ }
+ return 0;
+}
+
+void videobuf_queue_cancel(struct videobuf_queue *q)
+{
+ unsigned long flags=0;
+ int i;
+
+ /* remove queued buffers from list */
+ if (q->irqlock)
+ spin_lock_irqsave(q->irqlock,flags);
+ for (i = 0; i < VIDEO_MAX_FRAME; i++) {
+ if (NULL == q->bufs[i])
+ continue;
+ if (q->bufs[i]->state == STATE_QUEUED) {
+ list_del(&q->bufs[i]->queue);
+ q->bufs[i]->state = STATE_ERROR;
+ }
+ }
+ if (q->irqlock)
+ spin_unlock_irqrestore(q->irqlock,flags);
+
+ /* free all buffers + clear queue */
+ for (i = 0; i < VIDEO_MAX_FRAME; i++) {
+ if (NULL == q->bufs[i])
+ continue;
+ q->ops->buf_release(q,q->bufs[i]);
+ }
+ INIT_LIST_HEAD(&q->stream);
+}
+
+/* --------------------------------------------------------------------- */
+
+enum v4l2_field videobuf_next_field(struct videobuf_queue *q)
+{
+ enum v4l2_field field = q->field;
+
+ BUG_ON(V4L2_FIELD_ANY == field);
+
+ if (V4L2_FIELD_ALTERNATE == field) {
+ if (V4L2_FIELD_TOP == q->last) {
+ field = V4L2_FIELD_BOTTOM;
+ q->last = V4L2_FIELD_BOTTOM;
+ } else {
+ field = V4L2_FIELD_TOP;
+ q->last = V4L2_FIELD_TOP;
+ }
+ }
+ return field;
+}
+
+static void videobuf_status(struct videobuf_queue *q, struct v4l2_buffer *b,
+ struct videobuf_buffer *vb, enum v4l2_buf_type type)
+{
+ MAGIC_CHECK(vb->magic,MAGIC_BUFFER);
+ MAGIC_CHECK(q->int_ops->magic,MAGIC_QTYPE_OPS);
+
+ b->index = vb->i;
+ b->type = type;
+
+ b->memory = vb->memory;
+ switch (b->memory) {
+ case V4L2_MEMORY_MMAP:
+ b->m.offset = vb->boff;
+ b->length = vb->bsize;
+ break;
+ case V4L2_MEMORY_USERPTR:
+ b->m.userptr = vb->baddr;
+ b->length = vb->bsize;
+ break;
+ case V4L2_MEMORY_OVERLAY:
+ b->m.offset = vb->boff;
+ break;
+ }
+
+ b->flags = 0;
+ if (vb->map)
+ b->flags |= V4L2_BUF_FLAG_MAPPED;
+
+ switch (vb->state) {
+ case STATE_PREPARED:
+ case STATE_QUEUED:
+ case STATE_ACTIVE:
+ b->flags |= V4L2_BUF_FLAG_QUEUED;
+ break;
+ case STATE_DONE:
+ case STATE_ERROR:
+ b->flags |= V4L2_BUF_FLAG_DONE;
+ break;
+ case STATE_NEEDS_INIT:
+ case STATE_IDLE:
+ /* nothing */
+ break;
+ }
+
+ if (vb->input != UNSET) {
+ b->flags |= V4L2_BUF_FLAG_INPUT;
+ b->input = vb->input;
+ }
+
+ b->field = vb->field;
+ b->timestamp = vb->ts;
+ b->bytesused = vb->size;
+ b->sequence = vb->field_count >> 1;
+}
+
+int videobuf_reqbufs(struct videobuf_queue *q,
+ struct v4l2_requestbuffers *req)
+{
+ unsigned int size,count;
+ int retval;
+
+ if (req->type != q->type) {
+ dprintk(1,"reqbufs: queue type invalid\n");
+ return -EINVAL;
+ }
+ if (req->count < 1) {
+ dprintk(1,"reqbufs: count invalid (%d)\n",req->count);
+ return -EINVAL;
+ }
+ if (req->memory != V4L2_MEMORY_MMAP &&
+ req->memory != V4L2_MEMORY_USERPTR &&
+ req->memory != V4L2_MEMORY_OVERLAY) {
+ dprintk(1,"reqbufs: memory type invalid\n");
+ return -EINVAL;
+ }
+
+ mutex_lock(&q->lock);
+ if (q->streaming) {
+ dprintk(1,"reqbufs: streaming already exists\n");
+ retval = -EBUSY;
+ goto done;
+ }
+ if (!list_empty(&q->stream)) {
+ dprintk(1,"reqbufs: stream running\n");
+ retval = -EBUSY;
+ goto done;
+ }
+
+ count = req->count;
+ if (count > VIDEO_MAX_FRAME)
+ count = VIDEO_MAX_FRAME;
+ size = 0;
+ q->ops->buf_setup(q,&count,&size);
+ size = PAGE_ALIGN(size);
+ dprintk(1,"reqbufs: bufs=%d, size=0x%x [%d pages total]\n",
+ count, size, (count*size)>>PAGE_SHIFT);
+
+ retval = videobuf_mmap_setup(q,count,size,req->memory);
+ if (retval < 0) {
+ dprintk(1,"reqbufs: mmap setup returned %d\n",retval);
+ goto done;
+ }
+
+ req->count = retval;
+
+ done:
+ mutex_unlock(&q->lock);
+ return retval;
+}
+
+int videobuf_querybuf(struct videobuf_queue *q, struct v4l2_buffer *b)
+{
+ if (unlikely(b->type != q->type)) {
+ dprintk(1,"querybuf: Wrong type.\n");
+ return -EINVAL;
+ }
+ if (unlikely(b->index < 0 || b->index >= VIDEO_MAX_FRAME)) {
+ dprintk(1,"querybuf: index out of range.\n");
+ return -EINVAL;
+ }
+ if (unlikely(NULL == q->bufs[b->index])) {
+ dprintk(1,"querybuf: buffer is null.\n");
+ return -EINVAL;
+ }
+ videobuf_status(q,b,q->bufs[b->index],q->type);
+ return 0;
+}
+
+int videobuf_qbuf(struct videobuf_queue *q,
+ struct v4l2_buffer *b)
+{
+ struct videobuf_buffer *buf;
+ enum v4l2_field field;
+ unsigned long flags=0;
+ int retval;
+
+ MAGIC_CHECK(q->int_ops->magic,MAGIC_QTYPE_OPS);
+
+ if (b->memory == V4L2_MEMORY_MMAP)
+ down_read(&current->mm->mmap_sem);
+
+ mutex_lock(&q->lock);
+ retval = -EBUSY;
+ if (q->reading) {
+ dprintk(1,"qbuf: Reading running...\n");
+ goto done;
+ }
+ retval = -EINVAL;
+ if (b->type != q->type) {
+ dprintk(1,"qbuf: Wrong type.\n");
+ goto done;
+ }
+ if (b->index < 0 || b->index >= VIDEO_MAX_FRAME) {
+ dprintk(1,"qbuf: index out of range.\n");
+ goto done;
+ }
+ buf = q->bufs[b->index];
+ if (NULL == buf) {
+ dprintk(1,"qbuf: buffer is null.\n");
+ goto done;
+ }
+ MAGIC_CHECK(buf->magic,MAGIC_BUFFER);
+ if (buf->memory != b->memory) {
+ dprintk(1,"qbuf: memory type is wrong.\n");
+ goto done;
+ }
+ if (buf->state != STATE_NEEDS_INIT && buf->state != STATE_IDLE) {
+ dprintk(1,"qbuf: buffer is already queued or active.\n");
+ goto done;
+ }
+
+ if (b->flags & V4L2_BUF_FLAG_INPUT) {
+ if (b->input >= q->inputs) {
+ dprintk(1,"qbuf: wrong input.\n");
+ goto done;
+ }
+ buf->input = b->input;
+ } else {
+ buf->input = UNSET;
+ }
+
+ switch (b->memory) {
+ case V4L2_MEMORY_MMAP:
+ if (0 == buf->baddr) {
+ dprintk(1,"qbuf: mmap requested but buffer addr is zero!\n");
+ goto done;
+ }
+ break;
+ case V4L2_MEMORY_USERPTR:
+ if (b->length < buf->bsize) {
+ dprintk(1,"qbuf: buffer length is not enough\n");
+ goto done;
+ }
+ if (STATE_NEEDS_INIT != buf->state && buf->baddr != b->m.userptr)
+ q->ops->buf_release(q,buf);
+ buf->baddr = b->m.userptr;
+ break;
+ case V4L2_MEMORY_OVERLAY:
+ buf->boff = b->m.offset;
+ break;
+ default:
+ dprintk(1,"qbuf: wrong memory type\n");
+ goto done;
+ }
+
+ dprintk(1,"qbuf: requesting next field\n");
+ field = videobuf_next_field(q);
+ retval = q->ops->buf_prepare(q,buf,field);
+ if (0 != retval) {
+ dprintk(1,"qbuf: buffer_prepare returned %d\n",retval);
+ goto done;
+ }
+
+ list_add_tail(&buf->stream,&q->stream);
+ if (q->streaming) {
+ if (q->irqlock)
+ spin_lock_irqsave(q->irqlock,flags);
+ q->ops->buf_queue(q,buf);
+ if (q->irqlock)
+ spin_unlock_irqrestore(q->irqlock,flags);
+ }
+ dprintk(1,"qbuf: succeded\n");
+ retval = 0;
+
+ done:
+ mutex_unlock(&q->lock);
+
+ if (b->memory == V4L2_MEMORY_MMAP)
+ up_read(&current->mm->mmap_sem);
+
+ return retval;
+}
+
+int videobuf_dqbuf(struct videobuf_queue *q,
+ struct v4l2_buffer *b, int nonblocking)
+{
+ struct videobuf_buffer *buf;
+ int retval;
+
+ MAGIC_CHECK(q->int_ops->magic,MAGIC_QTYPE_OPS);
+
+ mutex_lock(&q->lock);
+ retval = -EBUSY;
+ if (q->reading) {
+ dprintk(1,"dqbuf: Reading running...\n");
+ goto done;
+ }
+ retval = -EINVAL;
+ if (b->type != q->type) {
+ dprintk(1,"dqbuf: Wrong type.\n");
+ goto done;
+ }
+ if (list_empty(&q->stream)) {
+ dprintk(1,"dqbuf: stream running\n");
+ goto done;
+ }
+ buf = list_entry(q->stream.next, struct videobuf_buffer, stream);
+ retval = videobuf_waiton(buf, nonblocking, 1);
+ if (retval < 0) {
+ dprintk(1,"dqbuf: waiton returned %d\n",retval);
+ goto done;
+ }
+ switch (buf->state) {
+ case STATE_ERROR:
+ dprintk(1,"dqbuf: state is error\n");
+ retval = -EIO;
+ CALL(q,sync,q, buf);
+ buf->state = STATE_IDLE;
+ break;
+ case STATE_DONE:
+ dprintk(1,"dqbuf: state is done\n");
+ CALL(q,sync,q, buf);
+ buf->state = STATE_IDLE;
+ break;
+ default:
+ dprintk(1,"dqbuf: state invalid\n");
+ retval = -EINVAL;
+ goto done;
+ }
+ list_del(&buf->stream);
+ memset(b,0,sizeof(*b));
+ videobuf_status(q,b,buf,q->type);
+
+ done:
+ mutex_unlock(&q->lock);
+ return retval;
+}
+
+int videobuf_streamon(struct videobuf_queue *q)
+{
+ struct videobuf_buffer *buf;
+ unsigned long flags=0;
+ int retval;
+
+ mutex_lock(&q->lock);
+ retval = -EBUSY;
+ if (q->reading)
+ goto done;
+ retval = 0;
+ if (q->streaming)
+ goto done;
+ q->streaming = 1;
+ if (q->irqlock)
+ spin_lock_irqsave(q->irqlock,flags);
+ list_for_each_entry(buf, &q->stream, stream)
+ if (buf->state == STATE_PREPARED)
+ q->ops->buf_queue(q,buf);
+ if (q->irqlock)
+ spin_unlock_irqrestore(q->irqlock,flags);
+
+ done:
+ mutex_unlock(&q->lock);
+ return retval;
+}
+
+int videobuf_streamoff(struct videobuf_queue *q)
+{
+ int retval = -EINVAL;
+
+ mutex_lock(&q->lock);
+ if (!q->streaming)
+ goto done;
+ videobuf_queue_cancel(q);
+ q->streaming = 0;
+ retval = 0;
+
+ done:
+ mutex_unlock(&q->lock);
+ return retval;
+}
+
+static ssize_t videobuf_read_zerocopy(struct videobuf_queue *q,
+ char __user *data,
+ size_t count, loff_t *ppos)
+{
+ enum v4l2_field field;
+ unsigned long flags=0;
+ int retval;
+
+ MAGIC_CHECK(q->int_ops->magic,MAGIC_QTYPE_OPS);
+
+ /* setup stuff */
+ q->read_buf = videobuf_alloc(q);
+ if (NULL == q->read_buf)
+ return -ENOMEM;
+
+ q->read_buf->memory = V4L2_MEMORY_USERPTR;
+ q->read_buf->baddr = (unsigned long)data;
+ q->read_buf->bsize = count;
+
+ field = videobuf_next_field(q);
+ retval = q->ops->buf_prepare(q,q->read_buf,field);
+ if (0 != retval)
+ goto done;
+
+ /* start capture & wait */
+ if (q->irqlock)
+ spin_lock_irqsave(q->irqlock,flags);
+ q->ops->buf_queue(q,q->read_buf);
+ if (q->irqlock)
+ spin_unlock_irqrestore(q->irqlock,flags);
+ retval = videobuf_waiton(q->read_buf,0,0);
+ if (0 == retval) {
+ CALL(q,sync,q,q->read_buf);
+ if (STATE_ERROR == q->read_buf->state)
+ retval = -EIO;
+ else
+ retval = q->read_buf->size;
+ }
+
+ done:
+ /* cleanup */
+ q->ops->buf_release(q,q->read_buf);
+ kfree(q->read_buf);
+ q->read_buf = NULL;
+ return retval;
+}
+
+ssize_t videobuf_read_one(struct videobuf_queue *q,
+ char __user *data, size_t count, loff_t *ppos,
+ int nonblocking)
+{
+ enum v4l2_field field;
+ unsigned long flags=0;
+ unsigned size, nbufs;
+ int retval;
+
+ MAGIC_CHECK(q->int_ops->magic,MAGIC_QTYPE_OPS);
+
+ mutex_lock(&q->lock);
+
+ nbufs = 1; size = 0;
+ q->ops->buf_setup(q,&nbufs,&size);
+
+ if (NULL == q->read_buf &&
+ count >= size &&
+ !nonblocking) {
+ retval = videobuf_read_zerocopy(q,data,count,ppos);
+ if (retval >= 0 || retval == -EIO)
+ /* ok, all done */
+ goto done;
+ /* fallback to kernel bounce buffer on failures */
+ }
+
+ if (NULL == q->read_buf) {
+ /* need to capture a new frame */
+ retval = -ENOMEM;
+ q->read_buf = videobuf_alloc(q);
+
+ dprintk(1,"video alloc=0x%p\n", q->read_buf);
+ if (NULL == q->read_buf)
+ goto done;
+ q->read_buf->memory = V4L2_MEMORY_USERPTR;
+ q->read_buf->bsize = count; /* preferred size */
+ field = videobuf_next_field(q);
+ retval = q->ops->buf_prepare(q,q->read_buf,field);
+
+ if (0 != retval) {
+ kfree (q->read_buf);
+ q->read_buf = NULL;
+ goto done;
+ }
+ if (q->irqlock)
+ spin_lock_irqsave(q->irqlock,flags);
+
+ q->ops->buf_queue(q,q->read_buf);
+ if (q->irqlock)
+ spin_unlock_irqrestore(q->irqlock,flags);
+ q->read_off = 0;
+ }
+
+ /* wait until capture is done */
+ retval = videobuf_waiton(q->read_buf, nonblocking, 1);
+ if (0 != retval)
+ goto done;
+
+ CALL(q,sync,q,q->read_buf);
+
+ if (STATE_ERROR == q->read_buf->state) {
+ /* catch I/O errors */
+ q->ops->buf_release(q,q->read_buf);
+ kfree(q->read_buf);
+ q->read_buf = NULL;
+ retval = -EIO;
+ goto done;
+ }
+
+ /* Copy to userspace */
+ retval=CALL(q,copy_to_user,q,data,count,nonblocking);
+ if (retval<0)
+ goto done;
+
+ q->read_off += retval;
+ if (q->read_off == q->read_buf->size) {
+ /* all data copied, cleanup */
+ q->ops->buf_release(q,q->read_buf);
+ kfree(q->read_buf);
+ q->read_buf = NULL;
+ }
+
+ done:
+ mutex_unlock(&q->lock);
+ return retval;
+}
+
+int videobuf_read_start(struct videobuf_queue *q)
+{
+ enum v4l2_field field;
+ unsigned long flags=0;
+ unsigned int count = 0, size = 0;
+ int err, i;
+
+ q->ops->buf_setup(q,&count,&size);
+ if (count < 2)
+ count = 2;
+ if (count > VIDEO_MAX_FRAME)
+ count = VIDEO_MAX_FRAME;
+ size = PAGE_ALIGN(size);
+
+ err = videobuf_mmap_setup(q, count, size, V4L2_MEMORY_USERPTR);
+ if (err < 0)
+ return err;
+
+ count = err;
+
+ for (i = 0; i < count; i++) {
+ field = videobuf_next_field(q);
+ err = q->ops->buf_prepare(q,q->bufs[i],field);
+ if (err)
+ return err;
+ list_add_tail(&q->bufs[i]->stream, &q->stream);
+ }
+ if (q->irqlock)
+ spin_lock_irqsave(q->irqlock,flags);
+ for (i = 0; i < count; i++)
+ q->ops->buf_queue(q,q->bufs[i]);
+ if (q->irqlock)
+ spin_unlock_irqrestore(q->irqlock,flags);
+ q->reading = 1;
+ return 0;
+}
+
+void videobuf_read_stop(struct videobuf_queue *q)
+{
+ int i;
+
+ videobuf_queue_cancel(q);
+ videobuf_mmap_free(q);
+ INIT_LIST_HEAD(&q->stream);
+ for (i = 0; i < VIDEO_MAX_FRAME; i++) {
+ if (NULL == q->bufs[i])
+ continue;
+ kfree(q->bufs[i]);
+ q->bufs[i] = NULL;
+ }
+ q->read_buf = NULL;
+ q->reading = 0;
+}
+
+ssize_t videobuf_read_stream(struct videobuf_queue *q,
+ char __user *data, size_t count, loff_t *ppos,
+ int vbihack, int nonblocking)
+{
+ int rc, retval;
+ unsigned long flags=0;
+
+ MAGIC_CHECK(q->int_ops->magic,MAGIC_QTYPE_OPS);
+
+ dprintk(2,"%s\n",__FUNCTION__);
+ mutex_lock(&q->lock);
+ retval = -EBUSY;
+ if (q->streaming)
+ goto done;
+ if (!q->reading) {
+ retval = videobuf_read_start(q);
+ if (retval < 0)
+ goto done;
+ }
+
+ retval = 0;
+ while (count > 0) {
+ /* get / wait for data */
+ if (NULL == q->read_buf) {
+ q->read_buf = list_entry(q->stream.next,
+ struct videobuf_buffer,
+ stream);
+ list_del(&q->read_buf->stream);
+ q->read_off = 0;
+ }
+ rc = videobuf_waiton(q->read_buf, nonblocking, 1);
+ if (rc < 0) {
+ if (0 == retval)
+ retval = rc;
+ break;
+ }
+
+ if (q->read_buf->state == STATE_DONE) {
+ rc = CALL (q,copy_stream, q, data + retval, count,
+ retval, vbihack, nonblocking);
+ if (rc < 0) {
+ retval = rc;
+ break;
+ }
+ retval += rc;
+ count -= rc;
+ q->read_off += rc;
+ } else {
+ /* some error */
+ q->read_off = q->read_buf->size;
+ if (0 == retval)
+ retval = -EIO;
+ }
+
+ /* requeue buffer when done with copying */
+ if (q->read_off == q->read_buf->size) {
+ list_add_tail(&q->read_buf->stream,
+ &q->stream);
+ if (q->irqlock)
+ spin_lock_irqsave(q->irqlock,flags);
+ q->ops->buf_queue(q,q->read_buf);
+ if (q->irqlock)
+ spin_unlock_irqrestore(q->irqlock,flags);
+ q->read_buf = NULL;
+ }
+ if (retval < 0)
+ break;
+ }
+
+ done:
+ mutex_unlock(&q->lock);
+ return retval;
+}
+
+unsigned int videobuf_poll_stream(struct file *file,
+ struct videobuf_queue *q,
+ poll_table *wait)
+{
+ struct videobuf_buffer *buf = NULL;
+ unsigned int rc = 0;
+
+ mutex_lock(&q->lock);
+ if (q->streaming) {
+ if (!list_empty(&q->stream))
+ buf = list_entry(q->stream.next,
+ struct videobuf_buffer, stream);
+ } else {
+ if (!q->reading)
+ videobuf_read_start(q);
+ if (!q->reading) {
+ rc = POLLERR;
+ } else if (NULL == q->read_buf) {
+ q->read_buf = list_entry(q->stream.next,
+ struct videobuf_buffer,
+ stream);
+ list_del(&q->read_buf->stream);
+ q->read_off = 0;
+ }
+ buf = q->read_buf;
+ }
+ if (!buf)
+ rc = POLLERR;
+
+ if (0 == rc) {
+ poll_wait(file, &buf->done, wait);
+ if (buf->state == STATE_DONE ||
+ buf->state == STATE_ERROR)
+ rc = POLLIN|POLLRDNORM;
+ }
+ mutex_unlock(&q->lock);
+ return rc;
+}
+
+int videobuf_mmap_setup(struct videobuf_queue *q,
+ unsigned int bcount, unsigned int bsize,
+ enum v4l2_memory memory)
+{
+ unsigned int i;
+ int err;
+
+ MAGIC_CHECK(q->int_ops->magic,MAGIC_QTYPE_OPS);
+
+ err = videobuf_mmap_free(q);
+ if (0 != err)
+ return err;
+
+ /* Allocate and initialize buffers */
+ for (i = 0; i < bcount; i++) {
+ q->bufs[i] = videobuf_alloc(q);
+
+ if (q->bufs[i] == NULL)
+ break;
+
+ q->bufs[i]->i = i;
+ q->bufs[i]->input = UNSET;
+ q->bufs[i]->memory = memory;
+ q->bufs[i]->bsize = bsize;
+ switch (memory) {
+ case V4L2_MEMORY_MMAP:
+ q->bufs[i]->boff = bsize * i;
+ break;
+ case V4L2_MEMORY_USERPTR:
+ case V4L2_MEMORY_OVERLAY:
+ /* nothing */
+ break;
+ }
+ }
+
+ if (!i)
+ return -ENOMEM;
+
+ dprintk(1,"mmap setup: %d buffers, %d bytes each\n",
+ i, bsize);
+
+ return i;
+}
+
+int videobuf_mmap_free(struct videobuf_queue *q)
+{
+ int i;
+ int rc;
+
+ if (!q)
+ return 0;
+
+ MAGIC_CHECK(q->int_ops->magic,MAGIC_QTYPE_OPS);
+
+ rc = CALL(q,mmap_free,q);
+ if (rc<0)
+ return rc;
+
+ for (i = 0; i < VIDEO_MAX_FRAME; i++) {
+ if (NULL == q->bufs[i])
+ continue;
+ q->ops->buf_release(q,q->bufs[i]);
+ kfree(q->bufs[i]);
+ q->bufs[i] = NULL;
+ }
+
+ return rc;
+}
+
+int videobuf_mmap_mapper(struct videobuf_queue *q,
+ struct vm_area_struct *vma)
+{
+ int retval;
+
+ MAGIC_CHECK(q->int_ops->magic,MAGIC_QTYPE_OPS);
+
+ mutex_lock(&q->lock);
+ retval=CALL(q,mmap_mapper,q,vma);
+ mutex_unlock(&q->lock);
+
+ return retval;
+}
+
+#ifdef CONFIG_VIDEO_V4L1_COMPAT
+int videobuf_cgmbuf(struct videobuf_queue *q,
+ struct video_mbuf *mbuf, int count)
+{
+ struct v4l2_requestbuffers req;
+ int rc,i;
+
+ MAGIC_CHECK(q->int_ops->magic,MAGIC_QTYPE_OPS);
+
+ memset(&req,0,sizeof(req));
+ req.type = q->type;
+ req.count = count;
+ req.memory = V4L2_MEMORY_MMAP;
+ rc = videobuf_reqbufs(q,&req);
+ if (rc < 0)
+ return rc;
+
+ mbuf->frames = req.count;
+ mbuf->size = 0;
+ for (i = 0; i < mbuf->frames; i++) {
+ mbuf->offsets[i] = q->bufs[i]->boff;
+ mbuf->size += q->bufs[i]->bsize;
+ }
+
+ return 0;
+}
+#endif
+
+/* --------------------------------------------------------------------- */
+
+EXPORT_SYMBOL_GPL(videobuf_waiton);
+EXPORT_SYMBOL_GPL(videobuf_iolock);
+
+EXPORT_SYMBOL_GPL(videobuf_alloc);
+
+EXPORT_SYMBOL_GPL(videobuf_queue_core_init);
+EXPORT_SYMBOL_GPL(videobuf_queue_cancel);
+EXPORT_SYMBOL_GPL(videobuf_queue_is_busy);
+
+EXPORT_SYMBOL_GPL(videobuf_next_field);
+EXPORT_SYMBOL_GPL(videobuf_reqbufs);
+EXPORT_SYMBOL_GPL(videobuf_querybuf);
+EXPORT_SYMBOL_GPL(videobuf_qbuf);
+EXPORT_SYMBOL_GPL(videobuf_dqbuf);
+EXPORT_SYMBOL_GPL(videobuf_cgmbuf);
+EXPORT_SYMBOL_GPL(videobuf_streamon);
+EXPORT_SYMBOL_GPL(videobuf_streamoff);
+
+EXPORT_SYMBOL_GPL(videobuf_read_start);
+EXPORT_SYMBOL_GPL(videobuf_read_stop);
+EXPORT_SYMBOL_GPL(videobuf_read_stream);
+EXPORT_SYMBOL_GPL(videobuf_read_one);
+EXPORT_SYMBOL_GPL(videobuf_poll_stream);
+
+EXPORT_SYMBOL_GPL(videobuf_mmap_setup);
+EXPORT_SYMBOL_GPL(videobuf_mmap_free);
+EXPORT_SYMBOL_GPL(videobuf_mmap_mapper);
+
+/*
+ * Local variables:
+ * c-basic-offset: 8
+ * End:
+ */
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-12 03:32:58 +0000